Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

How to Replace the Key Battery on a Smart 451

Model: Smart Smart 451 - Years 2007-2015
Part: Key

If the key for your Smart 451 has suddenly stopped working, it is likely that the small button battery inside has completely drained. In this guide, you will learn how to correctly and safely replace the battery. First, open the key cover with your hands, then remove the battery holder and replace it with a new compatible battery. Once fitted, reassemble the key cover, and the procedure is successfully completed.

Updated on 30 August 2026 by ScegliAuto

Video tutorial

Related tutorials

How to Replace the Key Battery in Your Smart 451
How to Replace the Key Battery in Your Smart 451
Smart (2007-2015 / 451) The steps required to replace the battery in your Smart 451 key are few and simple. Let's discover what they are. First, obtain a standard flat-head …
Replacing Key Battery on Smart Fortwo 451
Replacing Key Battery on Smart Fortwo 451
Smart (2007-2015 / 451) Today, you will learn how to open the key remote and replace the internal battery of a Smart Fortwo 451; this operation is very simple and does not r…
Replacing the Key Fob Battery for Smart Fortwo 451
Replacing the Key Fob Battery for Smart Fortwo 451
Smart (2007-2015 / 451) In this video tutorial, you will learn how to disassemble and replace the battery in the remote key fob of a Smart 450 and 451 in simple steps. To do…

Other guides you may be interested in

    Frequently Asked Questions

    • Smart 1998-2007 - What to do if the key gets stuck in the Smart? Read answer

How to Reset the Central Locking of the Volkswagen Golf 4?

If the central locking system of the Volkswagen Golf 4 is not working, it is likely necessary to reset the system: to do this, open the driver's door and detach the side panel of the dashboard next to the steering wheel. Under this panel, you will find the fuses, including the one for the central locking, which is indicated in the manual as number 14. To reset the system, remove this fuse from its housing, then reinsert it or replace it with a new one of the same amperage: this will reset the central locking system.

Watch the video!


by ScegliAuto

More videos